Patents by Inventor Qide Zhang
Qide Zhang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9202512Abstract: According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.Type: GrantFiled: August 31, 2012Date of Patent: December 1, 2015Assignee: Marvell International LTD.Inventors: Chao Bi, Kui Cai, Kheong Sann Chan, Zhi Yong Ching, Moulay Rachid Elidrissi, Guchang Han, Zhimin He, Phyu Hla Nu, Jiang Feng Hu, Wei Hua, Quan Jiang, Siang Huei Leong, Wuzhong Lin, Bo Liu, Yansheng Ma, Chun Lian Ong, Jianzhong Shi, Cheng Su Soh, Sufui Sophia Tan, Li Wang, Chiew Leong Wong, Weiya Xi, Khai Leong Yong, Shengkai Yu, Yin Quan Yu, Zhimin Yuan, Jing Liang Zhang, Tiejun Zhou, Pantelis Alexopoulos, Budi Santoso, Qide Zhang, Kannan Sundaravadivelu, Ningyu Liu, Jianqiang Mou, Chong Wee Lee, Ke Gan, Boon Long Ibrahim See, Leonard Gonzaga, Wee Kiat Lim, Mengjun Liu, Venkataramanan Venkatakrishnan, Cheng Peng Tan
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Publication number: 20150146322Abstract: According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.Type: ApplicationFiled: August 31, 2012Publication date: May 28, 2015Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Chao Bi, Kui Cai, Kheong Sann Chan, Zhi Yong Ching, Moulay Rachid Elidrissi, Guchang Han, Zhimin He, Phyu Hla Nu, Jiang Feng Hu, Wei Hua, Quan Jiang, Siang Huei Leong, Wuzhong Lin, Bo Liu, Yansheng Ma, Chun Lian Ong, Jianzhong Shi, Cheng Su Soh, Sufui Sophia Tan, Li Wang, Chiew Leong Wong, Weiya Xi, Khai Leong Yong, Shengkai Yu, Yin Quan Yu, Zhimin Yuan, Jing Liang Zhang, Tiejun Zhou, Pantelis Alexopoulos, Budi Santoso, Qide Zhang, Kannan Sundaravadivelu, Ningyu Liu, Jianqiang Mou, Chong Wee Lee, Ke Gan, Boon Long Ibrahim See, Leonard Gonzaga, Wee Kiat Lim, Mengjun Liu, Venkataramanan Venkatakrishnan, Cheng Peng Tan
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Patent number: 6717308Abstract: A high precision spindle suitable for hard disk drives, optical disk drives, such as DVDs, CD drives, and other applications includes a hub, a hybrid hydrodynamic an aerodynamic bearing system, a brushless motor, a starting/stopping assistant device and a base. The hybrid fluid film bearing system ensures that the spindle works at high precision, low acoustic noise and low power consumption. The starting/stopping assistant device lifts the rotating portion of the spindle and its load by means of magnetic force, hence, reduces the friction between the contacted surfaces of thrust air bearing. It reduces the starting/stopping time and lessens the wear of bearing, therefore, effectively suppresses the contamination caused by wear particles. Magnetic seals are also provide to prevent journal bearing fluid from leaking.Type: GrantFiled: December 28, 2000Date of Patent: April 6, 2004Assignee: Data Storage InstituteInventors: Shixin Chen, Qide Zhang
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Patent number: 6674201Abstract: A spindle motor (10) including a stator component (16), a rotor component (18), including a hub (14) for supporting one or more discs, and a bearing assembly between tHe components, formed of a journal bearing (54) and a thrust bearing (52), wherein the journal bearing (54) is an aerodynamic bearing and the thrust bearing is adapted to function in a bi-directional manner and includes an annular member (30) projecting radially from one of the components into an associated recess (76) formed in the other of the components. Preferably, the annular member has two opposed bearing faces (68,70) arranged adjacent corresponding bearing surfaces of the recess, and a hydrodynamic bearing is formed between the respective bearing faces and surfaces.Type: GrantFiled: April 25, 2000Date of Patent: January 6, 2004Assignee: Data Storage InstituteInventors: Zhejie Liu, QiDe Zhang, Shixin Chen, Teck Seng Low
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Publication number: 20030201683Abstract: A high precision spindle suitable for hard disk drives, optical disk drives, such as DVDs, CD drives, and other applications includes a hub, a hybrid hydrodynamic an aerodynamic bearing system, a brushless motor, a starting/stopping assistant device and a base. The hybrid fluid film bearing system ensures that the spindle works at high precision, low acoustic noise and low power consumption. The starting/stopping assistant device lifts the rotating portion of the spindle and its load by means of magnetic force, hence, reduces the friction between the contacted surfaces of thrust air bearing. It reduces the starting/stopping time and lessens the wear of bearing, therefore, effectively suppresses the contamination caused by wear particles. Magnetic seals are also provide to prevent journal bearing fluid from leaking.Type: ApplicationFiled: December 28, 2000Publication date: October 30, 2003Inventors: Shixin Chen, Qide Zhang
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Patent number: 6545378Abstract: An electric spindle motor for use in precision instruments such as hard disk drives comprises a stationary sub-assembly and a rotary sub-assembly movable relative to the stationary sub-assembly for carrying magnetic disks. The electric spindle motor has an integrated bearing system including a hydrodynamic journal bearing for providing desired radial load and a magnetic bearing for reducing friction resistance during staring/stopping and running of the electric spindle motor. The rotary sub-assembly is suspended from the stationary sub-assembly by the activation of the magnetic bearing during the rotating of the electric spindle motor. The electric spindle motor having integrated hydrodynamic journal bearing and magnetic bearing of the present invention is capable of high speed and high accuracy running, providing increased radial load and stiffness, and reduces the friction resistance therefore improves the performance and power saving.Type: GrantFiled: December 21, 2001Date of Patent: April 8, 2003Assignee: Data Storage InstituteInventors: Shixin Chen, Qide Zhang
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Publication number: 20030025409Abstract: A spindle motor (10) including a stator component (16), a rotor component (18), including a hub (14) for supporting one or more discs, and a bearing assembly between tile components, formed of a journal bearing (54) and a thrust bearing (52), wherein the journal bearing (54) is an aerodynamic bearing and the thrust bearing is adapted to function in a bi-directional manner and includes an annular member (30) projecting radially from one of the components into an associated recess (76) formed in the other of the components. Preferably, the annular member has two opposed bearing faces (68,70) arranged adjacent corresponding, bearing surfaces of the recess, and a hydrodynamic bearing is formed between the respective bearing, faces and surfaces.Type: ApplicationFiled: April 25, 2000Publication date: February 6, 2003Inventors: Zhejie Liu, QiDe Zhang, Shixin Chen, Teck Seng Low
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Publication number: 20020089245Abstract: An electric spindle motor for use in precision instruments such as hard disk drives comprises a stationary sub-assembly and a rotary sub-assembly movable relative to the stationary sub-assembly for carrying magnetic disks. The electric spindle motor has an integrated bearing system including a hydrodynamic journal bearing for providing desired radial load and a magnetic bearing for reducing friction resistance during staring/stopping and running of the electric spindle motor. The rotary sub-assembly is suspended from the stationary sub-assembly by the activation of the magnetic bearing during the rotating of the electric spindle motor. The electric spindle motor having integrated hydrodynamic journal bearing and magnetic bearing of the present invention is capable of high speed and high accuracy running, providing increased radial load and stiffness, and reduces the friction resistance therefore improves the performance and power saving.Type: ApplicationFiled: December 21, 2001Publication date: July 11, 2002Inventors: Shixin Chen, Qide Zhang
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Patent number: 6020664Abstract: An electric spindle motor has a base assembly (19) and a hollow notatable hub (16) housing a motor. The hub (16) is mounted for rotation about an axis and a stator (12) is mounted on the base assembly (19) inside the hub (16). A liquid filled journal bearing (11, 21) acts between the base assembly (19) and the hub (16) to provide radial support of the hub (16). A gas filled thrust bearing (26, 27, 35) also acts between the hub (16) and base assembly (19) to provide at least axial support of the hub (16).Type: GrantFiled: May 18, 1999Date of Patent: February 1, 2000Assignee: Data Storage InstituteInventors: Zhejie Liu, Mohammed Abdul Jabbar, Qide Zhang, Teck Seng Low, Shixin Chen, Yuen Ann Mah
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Patent number: 5969448Abstract: An electric spindle motor has a base assembly (19) and a hollow notatable hub (16) housing a motor. The hub (16) is mounted for rotation about an axis and a stator (12) is mounted on the base assembly (19) inside the hub (16). A liquid filled journal bearing (11,21) acts between the base assembly (19) and the hub (16) to provide radial support of the hub (16). A gas filled thrust bearing (26, 27, 35) also acts between the hub (16) and base assembly (19) to provide at least axial support of the hub (16).Type: GrantFiled: July 3, 1997Date of Patent: October 19, 1999Assignee: Data Storage InstituteInventors: Zhejie Liu, M.A. Jabbar, Qide Zhang, Teck Seng Low, Shixin Chen, Yuen Ann Mah